!91»J FIELD CROPS. 229 



and cover crops conducted at various experimental centers are described. 

 Limited variety tests with tobacco are also noted. Experiments in growing 

 corn in alternate rows with tobacco for shade are reported as having been a 

 failure, the corn outgrowing the tobacco and thus necessitating the construc- 

 tion of shade frames. 



Experiments with liming rice seed beds before replanting showed yields 

 amounting to 2,160.3 kg. per hectare (about 1,922 lbs. per acre) for applications 

 of 2,800 lbs. of lime per hectare as compared with an average yield from the 

 untreated checks of 1,437.1 kg. 



Detailed tabulated data are presented giving the results of analyses of a 

 number of sugar cane varieties grown in the islands. 



Fallow and green manuring experiments on sandy soil at Askov, 1888- 

 1914, J. Hansen (Tifaskr. Planteavl, 25 (19J8), No. 1, pp. l-J,2).— Rotation ex- 

 periments including bare and green fallows, together with the use of barnyard 

 manure, commercial fertilizers, and green manure, in the culture of the crops, 

 were conducted on four series of duplicate plats. Nine combinations of crop 

 rotations and manurial treatment were compared. The rotation was fallow, 

 rye, buckwheat, and oats, but beginning with 1S93 potatoes were substituted 

 for buckwheat, and from 1899 to 1914 a mixed crop of oats, barley, peas, and 

 vetch was grown in place of oats. The crops used for green fallow were vetch 

 and oats, mustard and buckwheat, and lupines. The crop of vetch and oats 

 was taken from the land while the other two crops were plowed under for 

 green manure. In connection with the bare and green fallows, the effect of 

 using 20 tons of barnyard manure per tondeland (1.36 acres) for the entire 

 period of the rotation was studied. In one experiment where lupines were 

 plowed under, 1,000 lbs. of 14 per cent Thomas slag and 1,400 lbs. of kainit and 

 in another 460 lbs. of Thomas slag and 480 lbs. of kainit per tondeland were ap- 

 plied during the rotation. In two experiments no manurial treatment was given, 

 but the effect of growing and harvesting a crop of vetch and oats and of plow- 

 ing under a crop of lupines was observed. 



The yield of rye was increased more by means of different methods of 

 fallowing than was the yield of any other crop. The average production of 

 fodder units per tondeland ranged from 1.2S6 on bare fallow with barnyard 

 manure to 2,780 where lupines were turned under and barnyard manure was 

 applied in the course of the rotation. 



Potatoes gave practically 3,300 fodder units per tondeland each on bare fallow 

 and on the green fallows of vetch and oats and of lupines. The highest yield, 

 4,120 fodder units, was secured on the lupine series receiving barnyard manure, 

 and the yield ranking next, 3,710 fodder units, on the lupine series receiving 

 commercial fertilizers. 



The relative value of the different fallows, as based on the average yearly 

 yield per tondeland for all crops grown in the rotation and receiving barn- 

 yard manure, Is given as follows: Bare fallow 100, vetch and oats 121, lupines 

 137, and mustard and buckwheat 102. The lupine series treated with commer- 

 cial fertilizers ranked with the vetch and oats receiving manure. 



Moorculture Association's field experiments in 1917, H. von Feilitzen 

 (Svenska Mosskulturfor. Tidskr., 32 (191S), No. 3. pp. 272-283). — A report is 

 presented on 41 experiments conducted in 20 different localities. 



Liming peat soils which according to analysis already were supplied ade- 

 quately with lime gave varying results, ranging from a marked increase in 

 yield to no appreciable effect. On a bog soil in Norbotten the use of lime showed 

 even negative results. It is concluded that generally no injurious effects result 

 from the use of ordinary applications of lime on peat soils of good quality, 

 including an adequate lime content. 



